import os    
os.rename('sample4_2.txt', 'sample4_3.txt')  
   
target_line = "1）打开文件，"  
  
with open('sample4_3.txt', 'r', encoding='utf-8') as file:    
    while True:  
        line = file.readline()  
        if not line:  
            break  
        if target_line in line:
            next_line = file.readline()  
            if next_line:  
                print(next_line.strip()) 
            break  
  